The Army Air Forces In World War II, The Pacific: Guadalcanal to Saipan, Aug 1942-July 1944 - W.F. Craven and J.L. Cate:
“One of the Mustangs shot down was piloted by Colonel Melton, commander of the 311th Group, who was seen to bail out and land in territory where natives were generally friendly.” Sadly, that turned out not to be helpful as he was captured.
U.S. Military Academy graduates who died as POW of the Japanese (west-point.org web site):
Harry R. Melton Jr., Col, Air Corps, #10631, Academy class of 1936 - “killed in an Allied air or submarine attack on Japanese prisoner of war ship, or died later from wounds suffered in such an attack.”
Death on the Hellships: Prisoners at Sea in the Pacific War, by Gregory Michno:
More than 126,000 Allied prisoners of war were transported in 156 voyages on 134 Japanese merchant ships. More than 21,000 Americans were killed or injured from "friendly fire" from American submarines or planes as a result of being POWs on what the survivors called "hell ships."
Australian web site – http://home.st.net.au/~dunn/friendlyfire/powsunk01.htm
“On 12/13 September 1944, an American submarine attacked a Japanese convoy carrying 2,300 POW's that had left Singapore on 6 September 1944. A number of ships including Kachidoki Maru and Rokyu Maru, both carrying POW's, were sunk.”
The on-line encyclopedia, Wikipedia, lists Japanese “Hell Ships,” including the Kachidoki, sunk 12 Sep 1944 by the U.S.S. Pampanito, S.S. 383.
NARA – WW II POWs – Col. Melton was confined in Burma # 5 - Japanese Prison (Burma Cantonment).